The Kramer CP-AOCH-33 is a 33' long active optical HDMI cable that is plenum rated, it can handle up to 4K resolution with embedded audio. The cable derives its power from the HDMI source so no external power is required on either end. The cable is very easy to run since the connector is so small and the cable is so thin. If you need to run a plenum rated HDMI cable a long distance the Kramer CP-AOCH is an ideal choice.